Hammer



FIG. 1 is a perspective view of a hammer taken from one side and end showing my new design;

FIG. 2 is a perspective view thereof from the opposite side and end;

FIG. 3 is an end elevational view thereof;

FIG. 4 is a top plan view thereof; and

FIG. 5 is an underneath plan view thereof. 

The ornamental design for a hammer, as shown. 